Characterizing the Feshbach association of <sup>23</sup>Na<sup>40</sup>K molecules
POSTER
Abstract
The conversion of a mixture of Bose-Fermi atomic gases into fermionic Feshbach molecules, by sweeping the magnetic field across a Feshbach resonance, is limited by inelastic collisional loss. To characterize the loss during the association, we systematically measure the dimer-dimer, atom-dimer, and three-body loss in the 23Na-40K system and compare the loss with the zero-range scattering theory. We identify that the collisional loss between the sodium atoms and the Feshbach molecules is the bottleneck of the association. We observe surprisingly long-lived Feshbach molecules and a universal a^3 dependence of the fermionic dimer-dimer loss coefficient. Moreover, we observe a suppression of the three-body loss at unitary regime by Fermi degeneracy. These studies make it possible to prepare degenerate NaK Feshbach molecules.
Presenters
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Marcel Duda
- Max Planck Institute for Quantum Optics
- Max Planck Institute of Quantum Optics